Jun 5, 2006, 8:37 PM
Post #10 of 11
Hola Oakleys (did you guys invent those cool sunglasses??) I love them!!
Re: [Liz & Don Oakley] Glass Block Skylights
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OK couple of comments:
I have been in the glass-fabrication biz for almost 30 years....so I kinda know a little about this.
Glad you are NOT going with block for that huge opening!!!!
You mention that you have a polycarbonate "Lexan". This would be great if true.
One of the processes we do at work is to laminate "Lexan" with glass-cladding for security windows (jails/prisons/zoos and NOW government office buildings - can't make it fast enuf for dem dare bad ass terrorists that Dubbya is worried about) you get the idea.
So if you have Lexan (a very expensive and proprietary GE product) you should have a very strong and impact resistant panel. Now if the frame is bolted in and mortared down to the roof, like my two skylites in Ajijic you should have no problems as Rolly was indicating (preventing forced entry). You can drop bricks on Lexan from 20 feet above and have NO breakage.......that's if it is Lexan (I have my doubts about that in MX) so you might want to double check on that. I do hope it is so. We sell cut size Lexan 6mm (1/4") for about $35 usd per square foot. Prices for this product have almost doubled in 2 years with demand and of course "oil prices". The stuff ain't............Cheap!
fyi (I know you don't need to know this) but a 3/4" thick piece of Lexan meets Level III ballistics rating and will stop a bullet from a 357 Magnum (the dirty Harry "Clint Eastwood" handgun). seriously strong stuff!!
One other thing to know and research is the sealant (usually silicone) for skylites. This product comes in grades and quality. You really do NOT want to skimp here. DOW 795 or GE Sil-proof are the way to seal these. There are many silicone products out there. But I recommend you spend twice the price of the cheap stuff and you will likely NEVER have to mess with it again! Pay now or pay AGAIN later!
Definitely stay AWAY from plexiglass for overhead. If you see ANY evidence of "spider webs" (hairline fractures in the plastic) you know you have plexi. This will eventually fail. My guess is that the UV penetration in MX would cause plexi failure in 3 - 4 years. Probably wont leak but it will crack and discolor.
Acrylics are more common for residential than Lexan.
Here in the states the normal insulated glass infill for RESIDENTIAL overhead glazing is a 1" overall unit with the inboard lite (inside) as a 7/32" laminated(safety glass per code) and the outboard (outside) lite is a 1/4" tinted low-e.... (low-emissivity glass is factory coated with metallic coating (the human eye can not see it) and it reflects the long wave of the light spectrum - aka - radiant heat. Today the low-e coatings are allowing 80% visible light (daylite) the reason we want skylites and at the same time they reflect 60% of the heat gain. There are some very cool products now entering the market. Makes my job fun, helping Architects and designers to select the proper glass types for commercial structures. I did see a skylite at Home Depot - Guadalajara, with insulated glass, so these are likely imported from NOB.
One thing to mention about the size of your large skylite is that most local US building codes would likely make you split that into several pieces of glass NOT just one. But then we all know codes are a non-factor SOB
"NOT ALL WHO WANDER ARE LOST...."